Future/Future.Contract/Extensions/ControlHelper.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Controls.Primitives;
using System.Windows.Controls;
using System.Windows.Media;
using System.Globalization;
using Shapes= System.Windows.Shapes;
using System.Windows;
using System.Windows.Markup;

namespace Future.Contract
{
    public static partial class FutureHelper
    {
        /// <summary>
        /// 用于同步ComboBox的背景与边框画刷，同时设置下拉按钮的宽度与高度相同；也可以用选择的设置下拉按钮的内容UIElement。
        /// </summary>
        /// <param name="comboBox">要进行设置的ComboBox对象</param>
        /// <param name="hoverBrush">鼠标悬停时的下拉按钮背景画刷</param>
        /// <param name="handle">下拉按钮的内容UI元素</param>
        /// <param name="openedHandle">待选列表展开时下拉列表的内容UI元素</param>
        /// <param name="handleWidth">下拉按钮宽度</param>
        public static void RefreshBrushAddHandle(this ComboBox comboBox, Brush hoverBrush = null, UIElement handle = null, UIElement openedHandle = null, double handleWidth = 0)
        {
            if (comboBox == null) return;
            Brush background = comboBox.Background;
            Brush borderBrush = comboBox.BorderBrush;
            Thickness thickness = comboBox.BorderThickness;

            ToggleButton toggleButton = comboBox.Template.FindName("toggleButton", comboBox) as ToggleButton;
            Border toggleBorder = toggleButton.Template.FindName("templateRoot", toggleButton) as Border;
            toggleBorder.Background = background;
            toggleBorder.BorderBrush = borderBrush;
            toggleBorder.BorderThickness = thickness;

            if (comboBox.IsEditable)
            {
                TextBox textBox = comboBox.Template.FindName("PART_EditableTextBox", comboBox) as TextBox;
                Border textboxBorder = textBox.Parent as Border;
                textboxBorder.Background = new SolidColorBrush(Colors.Transparent);
                textboxBorder.BorderThickness = new Thickness(0);
            }

            Grid grid = toggleButton.Parent as Grid;  //TODO：ComboBox重置按钮插入：可以在这个布局面板中插入
            grid.VerticalAlignment = VerticalAlignment.Stretch;
            grid.ClearValue(Grid.HeightProperty);
            grid.ColumnDefinitions[1].Width = new GridLength((handleWidth == 0) ? comboBox.ActualHeight : handleWidth);
            Border splitBorder = toggleBorder.Child as Border;
            splitBorder.Width = (handleWidth == 0) ? comboBox.ActualHeight : handleWidth;
            splitBorder.BorderThickness = new Thickness(0.5, 0, 0, 0);//在下拉按钮左侧画一条线
            splitBorder.BorderBrush = borderBrush;

            if (hoverBrush != null)
            {
                splitBorder.MouseEnter += (s, e) => splitBorder.Background = hoverBrush;
                splitBorder.MouseLeave += (s, e) => splitBorder.Background = background;
            }
            if (handle != null)
            {
                splitBorder.Child = handle;
                if (openedHandle != null)
                {
                    comboBox.DropDownOpened += (s, e) => { splitBorder.Child = openedHandle; };
                    comboBox.DropDownClosed += (s, e) => { splitBorder.Child = handle; };
                }
            }
        }

        /// <summary>
        /// 用于同步DatePicker的背景与边框画刷，同时设置下拉按钮的宽度与高度相同；也可以用选择的设置下拉按钮的内容UIElement。
        /// </summary>
        /// <param name="datePicker">要进行画笔与布局重设的DatePicker对象</param>
        /// <param name="waterMark">水印信息</param>
        /// <param name="hoverBrush">鼠标悬停在下拉按钮上时的背景色</param>
        /// <param name="handle">用于更换下拉按钮上的图案</param>
        /// <param name="handleWidth">下拉按钮的宽度值</param>
        public static void RefreshBrushAddHandle(this DatePicker datePicker, string waterMark = "", Brush hoverBrush = null, UIElement handle = null, int handleWidth = 0)
        {
            DatePickerTextBox dpTextBox = datePicker.Template.FindName("PART_TextBox", datePicker) as DatePickerTextBox;
            dpTextBox.Background = datePicker.Background;
            dpTextBox.BorderBrush = new SolidColorBrush(Colors.Transparent);
            //处理水印区域边框
            (dpTextBox.Template.FindName("ContentElement", dpTextBox) as Border).BorderBrush = new SolidColorBrush(Colors.Transparent);
            (dpTextBox.Template.FindName("watermark_decorator", dpTextBox) as Border).BorderBrush = new SolidColorBrush(Colors.Transparent);
            //处理水印容器控件
            if (!string.IsNullOrEmpty(waterMark))
            {
                ContentControl watermarkControl = dpTextBox.Template.FindName("PART_Watermark", dpTextBox) as ContentControl;
                watermarkControl.Foreground = new SolidColorBrush(Colors.Gray);
                watermarkControl.Content = waterMark;
            }

            //PART_Root  ： [Grid]次一级布局容器，内部的布局结构由这个Grid控制；其父节点[Border]的Padding属性继承自DatePicket的Padding（默认2px）；可以向其内部插入重置按钮
            //PART_Button  ： [Button]下拉按钮，决定按钮的高度，间接决定输入框的高度；清除模板后可替换成自定义显示样式
            //PART_DisabledVisual  ： [Grid]内部第二个[Rectangle]元素决定了按钮的宽度，间接决定输入框的宽度

            //让编辑区与按钮尺寸随控件高度变化
            datePicker.VerticalContentAlignment = VerticalAlignment.Center;
            Grid partRoot = datePicker.Template.FindName("PART_Root", datePicker) as Grid;//TODO:选择重置按钮可以在这里插入
            partRoot.VerticalAlignment = VerticalAlignment.Stretch;
            partRoot.HorizontalAlignment = HorizontalAlignment.Stretch;
            partRoot.ColumnDefinitions[1].Width = new GridLength((handleWidth == 0) ? datePicker.ActualHeight : handleWidth);
            dpTextBox.VerticalContentAlignment = VerticalAlignment.Center;
            Button partButton = datePicker.Template.FindName("PART_Button", datePicker) as Button;
            partButton.ClearValue(Button.WidthProperty);
            partButton.VerticalAlignment = VerticalAlignment.Stretch;
            partButton.HorizontalAlignment = HorizontalAlignment.Stretch;

            //处理鼠标悬浮于日期面板展开按钮上时的背景变化
            if (hoverBrush != null)
            {
                Border hoverBorder = new Border()
                {
                    VerticalAlignment = VerticalAlignment.Stretch,
                    HorizontalAlignment = HorizontalAlignment.Stretch,
                    BorderBrush = new SolidColorBrush(Colors.Gray),
                    BorderThickness = new Thickness(0.5, 0, 0, 0),
                    Visibility = Visibility.Visible
                };
                partRoot.Children.Insert(0, hoverBorder);
                Grid.SetColumn(hoverBorder, 1);

                partButton.Width = hoverBorder.Width;
                partButton.MouseEnter += (s, e) => { hoverBorder.Background = hoverBrush; };
                partButton.MouseLeave += (s, e) => { hoverBorder.Background = new SolidColorBrush(Colors.Transparent); };
            }

            //处理更换日期面板展开按钮的内容
            if (handle != null)
            {
                string templateString = "" +
                    "<ResourceDictionary    xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\"\r\n" +
                    "                       xmlns:x=\"http://schemas.microsoft.com/winfx/2006/xaml\">\r\n" +
                    "   <ControlTemplate x:Key=\"dpButtonTemplate\" TargetType=\"Button\">\r\n" +
                    "       <Border BorderBrush=\"{TemplateBinding BorderBrush}\" Background=\"{TemplateBinding Background}\" BorderThickness=\"{TemplateBinding BorderThickness}\">\r\n" +
                    "           <ContentPresenter/>\r\n" +
                    "       </Border>\r\n" +
                    "   </ControlTemplate>\r\n" +
                    "</ResourceDictionary>\r\n";

                ResourceDictionary dictionary = XamlReader.Parse(templateString) as ResourceDictionary;
                ControlTemplate template = dictionary["dpButtonTemplate"] as ControlTemplate;
                partButton.Template = template;
                partButton.Content = handle;
            }
        }
        /// <summary>
        /// 将一个Path矢量图进行深拷贝后封装于ViewBox中
        /// </summary>
        /// <param name="pathGeometry">要封装的Path矢量图</param>
        /// <param name="fillBrush">填充画笔，不设置则使用源Path的画笔</param>
        /// <param name="strokeBrush">描边画笔，不设置则使用源Path的画笔</param>
        /// <returns>封装好的ViewBox对象</returns>
        public static Viewbox BoxingToViewBox(this Shapes.Path pathGeometry, Brush fillBrush = null, Brush strokeBrush = null)
        {
            if (pathGeometry == null) return null;
            string pathData = pathGeometry.Data.ToString();
            Shapes.Path targetPath = new Shapes.Path() { Data = Geometry.Parse(pathData), Fill = fillBrush ?? pathGeometry.Fill, Stroke = strokeBrush ?? pathGeometry.Stroke, Width = pathGeometry.Width, Height = pathGeometry.Height };

            return new Viewbox() { Child = targetPath, Stretch = Stretch.Uniform };
        }
    }
}